position on the celestial sphere where the ecliptic crosses the celestial equator going south
The intersection of the ecliptic and celestial equator where the Sun crosses the equator from north to south A time when every place on Earth has 12 hours of daylight and 12 hours of night
specific moment in the year (on September 22) when the Sun is directly on the celestial equator, moving south of the celestial equator
The sun is on the equator moving south, and marks the beginning of autumn, (in the sothern hemisphere this is the beginning of spring) At both equinoxes the day is the same length (12 hours on the earth) everywhere except at the poles
Midway between the Summer and Winter Solstices, the date when the ecliptic crosses the celestial equator Usually September 23
Date on which the Sun crosses the celestial equator moving southward, occurring on or near September 22